3. Calculate the circulation and flux along/across the given bounding curve and vector field. (a) The circle of radius 1 centered at the origin, and the vector field F - yl- xj (b) The circle of radius 1 centered at the origin, and the vector field F cityj = (c) The rectangle with vertices (0, 0), (3,0), (3, 1) and (0, 1), and the vector field F = ce" i + 20" j